OptionalalphaFragments whose texture-modulated alpha is below this are discarded (default: 0.5 with a map, else 0)
OptionalmapTexture id from loadTexture / createDataTexture; null (or 0) clears the map
OptionalmapUV offset [u, v] (default: [0, 0])
OptionalmapUV repeat [u, v] (default: [1, 1]); textures wrap
Texture mapping shared by materials, primitives and custom meshes. UVs: u runs left to right and v top to bottom (v = 0 is the top row of the image), so images are not flipped.